
/**
 * @file   hello.cpp
 * @author student <1474702863@qq.com>
 * @date   Tue Sep 21 23:48:10 2021
 * 
 * @brief  
 * 
 * 
 */

#include<iostream>
/** 
 * 
 * 
 * @param argc number of shell parameters.
 * @param argv strings
 * 
 * @return system signals
 */
int main(int argc, char* argv[])
{
  /// Just a demo.
  std::cout << "Hello world!" << std::endl;
  return 0;
};
